Features Durable Zinc Alloy Construction - Crafted from high-quality zinc alloy, this holder is resistant to corrosion and wear, ensuring long-lasting performance in any lab environment Innovative Three-Jaw Design - The three-jaw mechanism distributes weight evenly, providing a secure and stable grip on your flasks and tubes for reliable experimentation Non-Slip Claw with Sleeve - Features a specially designed claw portion with a non-slip sleeve that enhances grip, preventing accidental slips and ensuring your samples stay securely in place Versatile Compatibility - Ideal for holding small flasks or cylindrical glass tubes, this clamp accommodates a variety of lab equipment to meet your specific research needs Adjustable Clamp Diameter - The prong clamp adjusts to fit circular objects with diameters ranging from 0-80mm (0.0-3.1in), providing flexibility for different lab setups and experiments Features: 1、For charging devices such as chargers and mobile power sources, real-time monitoring of the charging state and a variety of data on a single screen display to meet diverse testing needs 2、Real-time display of the charging state of electrical appliances, voltage, current, capacity, energy, power, equivalent impedance, temperature and other indicators 3、High-definition color LCD display, 160-degree wide viewing angle, high brightn and long working life 4、4-digit accuracy for more accurate measurements 5、The product has power-off storage with guaranteed data 6、With triple protection for over-current, over-voltage and delayed power-off Specification: Item Type: USB Charger Tester Voltage: DC4V-30V (overvoltage protection can be set at will) Current: 0-5.5A (overvoltage protection can be set at will) Capacity: 0-99999mAh Power: 0-999.9mWh Timing: 0-99 hours Timing: 0-24 hours Internal Resistance: 0-999.99 ohm Power: 0-150W USB: Output USB3.0 Optional Style: White, Black Package List: 1 x USB Charger Tester 1 x User Manual Package List 1 x USB Charger Tester 1 x User Manual